Yes. I'm serious. Coins are just like paper. The face value and the metal value are independent of one another.
Gold and silver are more restricted under the law. Platinum is more free-wheelin', man.
They mint the coin, put it in a safe place and borrow against it. Acts exactly the same as an increase in the debt limit.
But instead, O can also simply force the increase in the debt limit if he wishes.
Some argue he may do so legally under section 4 of the 14th amendment. "The validity of the public debt of the United States, authorized by law, including debts incurred for payment of pensions and bounties for services in suppressing insurrection or rebellion, shall not be questioned. But neither the United States nor any state shall assume or pay any debt or obligation incurred in aid of insurrection or rebellion against the United States, or any claim for the loss or emancipation of any slave; but all such debts, obligations and claims shall be held illegal and void."
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